Butter stick



FIG. 1 is an illustration of an isometric view of a first embodiment of a butter stick;

FIG. 2 is an illustration of a top view of the butter stick of FIG. 1, with the bottom view being a mirror image thereof;

FIG. 3 is an illustration of a front view of the butter stick of FIG. 1, with the back view being a mirror image thereof; and,

FIG. 4 is an illustration of a right side view of the butter stick of FIG. 1, with the left side view being a mirror image thereof.

The dot-dash broken lines shown in FIGS. 1-4 illustrate the boundary of the claimed design that forms no part thereof. 

CLAIM The ornamental design for a butter stick, as shown and described. 